An unusual structural phase transition in Rb2HfF6 |
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Institution: | 1. Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa;2. De Beers Group Services, Private Bag X01, Southdale 2135, South Africa |
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Abstract: | An unusual structural phase transition in the crystalline compound Rb2HfF6 near room temperature has been observed from perturbed angular correlation (PAC) spectroscopy. Our measurements in this compound produce two different crystalline configurations characterized by ωQ=74.1(1) Mrad/s, η~0, δ~0 and ωQ=24.7(2) Mrad/s, η=0.53(1), and δ=4(2)%. From PAC measurements in different samples, it is found that crystal structure corresponding to ωQ=74 Mrad/s, η~0 transforms to the other quite arbitrarily with temperature and no definite temperature corresponding to this transition has been observed. This can possibly be attributed to displacive phase transition. |
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Keywords: | Inorganic compounds Chemical synthesis Crystal structure Microstructure Phase transitions |
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